Shell Programming and Scripting

Ok this might sound pretty weird but here is the request. Running on a linux system in bash or Perl (i really don't know perl but the end user has a few pearl script already)

Start File looks something like this (4000 entries)
TEST PLAN
T//TF
T-TF
TEST (T)
Hacker
...

I am thinking about loading each line then stepping through character by character into a regexp expression that covers Upper and lower cases. So the first line output should be:

[tT][eE][sS][tT][[:space:]][pP][lL][aA][nN]


ANY help would be appreciated, this is not for my section but a buddy in another section.

What's the purpose of the conversion?

To upload into a blocking file, blacklist.

Something to start with..

Code:

sed -e 's/[^ ]/[&\L&]/g' -e 's/\(.\)\1/\1\U\1/g'  filename

Or..

Code:

sed -e 's/[a-zA-Z]/[&\L&]/g' -e 's/\(.\)\1/\1\U\1/g' -e 's/ /[[:space]]/g' -e 's/[-\/)(]/[&]/g' infile